The Kingdom of Westphalia was a kingdom in Germany, with a population of 2.6 million, that existed from 1807 to 1813. It included territory in Hesse and other parts of present-day Germany. While formally independent, it was a vassal state of the First French Empire and was ruled by Napoleon's brother Jérôme Bonaparte. It was named after Westphalia, but this was a misnomer since the kingdom had little territory in common with that area.